
package com.laich.springcloud.security.feign;

import java.util.Collection;

import org.springframework.cloud.security.oauth2.client.AccessTokenContextRelay;
import org.springframework.cloud.security.oauth2.client.feign.OAuth2FeignRequestInterceptor;
import org.springframework.security.oauth2.client.OAuth2ClientContext;
import org.springframework.security.oauth2.client.resource.OAuth2ProtectedResourceDetails;
import org.springframework.security.oauth2.common.OAuth2AccessToken;

import cn.hutool.core.collection.CollUtil;
import feign.RequestTemplate;
import lombok.extern.slf4j.Slf4j;

/**
 * @author laich
 * @date 2019/2/1
 * 扩展OAuth2FeignRequestInterceptor
 */
@Slf4j
public class FeignClientInterceptor extends OAuth2FeignRequestInterceptor {
	private final OAuth2ClientContext oAuth2ClientContext;
	private final AccessTokenContextRelay accessTokenContextRelay;
	

	/**
	 * Default constructor which uses the provided OAuth2ClientContext and Bearer tokens
	 * within Authorization header
	 *
	 * @param oAuth2ClientContext     provided context
	 * @param resource                type of resource to be accessed
	 * @param accessTokenContextRelay
	 */
	public FeignClientInterceptor(OAuth2ClientContext oAuth2ClientContext
		, OAuth2ProtectedResourceDetails resource, AccessTokenContextRelay accessTokenContextRelay) {
		super(oAuth2ClientContext, resource);
		this.oAuth2ClientContext = oAuth2ClientContext;
		this.accessTokenContextRelay = accessTokenContextRelay;
	}


	/**
	 * Create a template with the header of provided name and extracted extract
	 * 1. 如果使用 非web 请求，header 区别
	 * 2. 根据authentication 还原请求token
	 *
	 * @param template
	 */
	@Override
    public void apply(RequestTemplate template) {

        if(oAuth2ClientContext.getAccessToken() != null && oAuth2ClientContext.getAccessToken().getValue() != null 
        		&& OAuth2AccessToken.BEARER_TYPE.equalsIgnoreCase(oAuth2ClientContext.getAccessToken().getTokenType()) ){
            template.header("Authorization", String.format("%s %s", OAuth2AccessToken.BEARER_TYPE, 
            		oAuth2ClientContext.getAccessToken().getValue()));
        }

    }
}
